San Antonio billionaire Red McCombs has invested in Allegiance Ambulance, allowing the private ambulance provider to expand its market.

Allegiance is one of the largest such operations in Texas, covering territory in northern, central and eastern portions of the state. The operation has more than 400 employees, 70 vehicles and 15 stations.

Company officials didn't disclose how much McCombs inveseted.

“With Mr. McCombs' financial backing, his large Texas presence and the operational guidance his organization provides, Allegiance will be expanding its market and broadening its service lines in out-of-hospital health care,” said Allegiance CEO David Phillips.

McCombs said he invested in Allegiance because of its vision for future health care, noting it provides community care, post-acute care and related services. “This will have the combined benefit of increasing patient satisfaction while reducing cost,” he said.

Allegiance accommodates patients with basic, advanced and critical care needs. It also provides 911 service, wheelchair van transportation and support services for people facing transitional and post-acute care.